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Woody perennial plant.
Most trees have a single self-supporting trunk containing woody tissues, and in most species the trunk produces secondary limbs called branches. Trees provide many valuable products, especially wood , one of the world's chief building materials, and wood pulp, used in papermaking. Wood is also a major fuel source. Trees supply edible fruit s and nut s. In addition, trees take in carbon dioxide and release oxygen during photosynthesis . Their root systems help retain water and soil, preventing floods and erosion. Trees and forests provide habitats for a wide variety of animals, and they beautify both natural and altered landscapes. redwood s; the oldest are the bristlecone pines, some of which are over 4,000 years old. See also conifer ; deciduous tree ; evergreen ; forest ; shrub ; softwood .
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[c mediumvioletred] (as used in expressions)
big tree
bodhi tree
bo tree
Christmas tree
deciduous tree
Joshua Tree National Park
monkey puzzle tree
phylogenetic tree
plane tree
rubber tree
tree fern
tree frog
tree toad
tree of heaven
Tree Sir Herbert Draper Beerbohm
{{link=tulip tree">tulip tree
world tree